External HD problems

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Apr 12, 2008
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I have a Mac Pro, running leopard, and two WD external Studio Drives. When I connect the drives, they mount fine and I am able to use them. However, after some time, both drives will unmount and I am not able to see them or use them. I can't determine why they are doing this. Each will unmount at different times so it doesn't seem to be a common event that causes the problem. Does anyone know what I can do to fix this problem and get my HDs to stay connected? Thanks in advance for your help.
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Just a WAG here.... are the WD Studio Drives set to spin down after a certain amount of time? In other words, is there a setting to put the drives to sleep, and perhaps it's activated?

Regards.
 

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